-90.02% is the change from 611 to 61
Calculation steps:
[( 61 - 611 ) ÷ 611] x 100 = -90.02%
Formula
Percentage change = [(61 - 611) / 611] x 100
Subtract the new number by the original number
61 - 611 = -550
-550 ÷ 611 = -0.900163666121113
-0.900163666121113 x 100 = -90.02%